Wireless tire pressure and temperature monitoring system

Abstract

A wireless tire pressure and temperature monitoring system comprises a wireless monitor and transmitter unit installed on the wheel rim and a digital receiver and display unit equipped near the driver's seat. The wireless monitor and transmitter unit further includes a pressure sensor; a temperature sensor; a differential amplifier connected to the pressure sensor, an attenuator connected to the temperature sensor; a micro controller for calculating and processing the pressure signal received from the differential amplifier and the temperature signal received from the attenuator; a transmitter for transmitting the signals to the digital receiver and display unit via a filter and a resonant antenna so that the driver is able to be informed of the tire stability of the vehicle to assure traffic security. A centrifugal switch connected to the micro controller is actuated to start monitoring when the vehicle speed exceeds a defined range (10 km/hr˜20 km/hr), and stop monitoring after the vehicle speed drops down below the aforesaid range for about five minutes.

1 . A wireless tire pressure and temperature monitoring system essentially comprising a wireless monitor and transmitter unit installed on the wheel rim and a digital receiver and display unit, wherein said wireless monitor and transmitter unit detects the tire pressure and temperature and transfers the data to said digital receiver and display unit for display through a resonance type antenna so as to inform the driver about the present state of the tire stability thereby assuring traffic security.  
     
     
         2 . The wireless tire pressure and temperature monitoring system of  claim 1 , wherein said wireless monitor and transmitter unit further includes: a pressure sensor for sensing the internal pressure of the tire; a temperature sensor for sensing the internal temperature of the tire; a differential amplifier connected to said pressure sensor for amplifying and transferring the signal received from said pressure sensor to a micro controller; an attenuator connected to said temperature sensor for transferring the signal received from said temperature sensor to said micro controller after being processed; said micro controller for calculating and processing the pressure signal received from said differential amplifier and the temperature signal received from said attenuator; a voltage regulator connected to said micro controller; a power supply switch controlled by the micro controller and a power source (battery unit) connected; said power source connected with said pressure sensor and said power supply switch; a centrifugal switch connected with said micro controller and said power source (batter unit) for automatically starting operation of said monitoring system in the case the vehicle speed reaches up to a defined range, or slows down lower than the above range for a defined time duration; a transmitter connected to said micro controller and power Supply through power switch for transmitting the pressure and temperature signals after being processed by said micro controller; a filter connected to said transmitter for filtering the signal outputted from said transmitter; and an antenna connected to said filter for transferring the pressure and temperature signals processed by said micro controller through said filter to said digital receiver and display unit in resonance mode.  
     
     
         3 . The wireless tire pressure and temperature monitoring system of  claim 1 , wherein said digital receiver and display unit includes a LCD surface board on which equipped with a temperature display key, a pressure display key, a LCD back light key, a set key and an alarm lamp so as to display the pressure and temperature signals received from said antenna on said LCD surface board in the digital display mode, and turn on said alarm lamp in the case the tire pressure and temperature are abnormal.  
     
     
         4 . The wireless tire pressure and temperature monitoring system of  claim 1 , wherein a housing with its bottom surface configurated into the same curvature as that of the wheel rim is provided for accommodating said monitoring system, two drilled holes are provided each on one end of said housing for passing through a steel belt so as to bind said housing on the outer edge of said wheel rim nearby the air valve of the tire, the tire pressure and temperature is measured through a ventilation hole on said air valve.